path: root/drivers/gpu/drm/radeon/atombios_dp.c

/*
 * Copyright 2007-8 Advanced Micro Devices, Inc.
 * Copyright 2008 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Dave Airlie
 *          Alex Deucher
 */
#include "drmP.h"
#include "radeon_drm.h"
#include "radeon.h"

#include "atom.h"
#include "atom-bits.h"
#include "drm_dp_helper.h"

/* move these to drm_dp_helper.c/h */
#define DP_LINK_CONFIGURATION_SIZE 9
#define DP_LINK_STATUS_SIZE	   6
#define DP_DPCD_SIZE	           8

static char *voltage_names[] = {
        "0.4V", "0.6V", "0.8V", "1.2V"
};
static char *pre_emph_names[] = {
        "0dB", "3.5dB", "6dB", "9.5dB"
};

/***** radeon AUX functions *****/
union aux_channel_transaction {
	PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1;
	PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2;
};

static int radeon_process_aux_ch(struct radeon_i2c_chan *chan,
				 u8 *send, int send_bytes,
				 u8 *recv, int recv_size,
				 u8 delay, u8 *ack)
{
	struct drm_device *dev = chan->dev;
	struct radeon_device *rdev = dev->dev_private;
	union aux_channel_transaction args;
	int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
	unsigned char *base;
	int recv_bytes;

	memset(&args, 0, sizeof(args));

	base = (unsigned char *)rdev->mode_info.atom_context->scratch;

	memcpy(base, send, send_bytes);

	args.v1.lpAuxRequest = 0;
	args.v1.lpDataOut = 16;
	args.v1.ucDataOutLen = 0;
	args.v1.ucChannelID = chan->rec.i2c_id;
	args.v1.ucDelay = delay / 10;
	if (ASIC_IS_DCE4(rdev))
		args.v2.ucHPD_ID = chan->rec.hpd;

	atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);

	*ack = args.v1.ucReplyStatus;

	/* timeout */
	if (args.v1.ucReplyStatus == 1) {
		DRM_DEBUG_KMS("dp_aux_ch timeout\n");
		return -ETIMEDOUT;
	}

	/* flags not zero */
	if (args.v1.ucReplyStatus == 2) {
		DRM_DEBUG_KMS("dp_aux_ch flags not zero\n");
		return -EBUSY;
	}

	/* error */
	if (args.v1.ucReplyStatus == 3) {
		DRM_DEBUG_KMS("dp_aux_ch error\n");
		return -EIO;
	}

	recv_bytes = args.v1.ucDataOutLen;
	if (recv_bytes > recv_size)
		recv_bytes = recv_size;

	if (recv && recv_size)
		memcpy(recv, base + 16, recv_bytes);

	return recv_bytes;
}

static int radeon_dp_aux_native_write(struct radeon_connector *radeon_connector,
				      u16 address, u8 *send, u8 send_bytes, u8 delay)
{
	struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
	int ret;
	u8 msg[20];
	int msg_bytes = send_bytes + 4;
	u8 ack;
	unsigned retry;

	if (send_bytes > 16)
		return -1;

	msg[0] = address;
	msg[1] = address >> 8;
	msg[2] = AUX_NATIVE_WRITE << 4;
	msg[3] = (msg_bytes << 4) | (send_bytes - 1);
	memcpy(&msg[4], send, send_bytes);

	for (retry = 0; retry < 4; retry++) {
		ret = radeon_process_aux_ch(dig_connector->dp_i2c_bus,
					    msg, msg_bytes, NULL, 0, delay, &ack);
		if (ret == -EBUSY)
			continue;
		else if (ret < 0)
			return ret;
		if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
			return send_bytes;
		else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
			udelay(400);